6300 MERRILL CREEK PKY BASE FILE 2018-01-01 MF Import

GEOTECHNICAL ENGINEERING STUDY Proposed Three-Buildfng Facfifty Lot 2F, Seaway Center Merrill Creek Parkway Everett, Washfngton This report presents the findings and recommendations of our geotechnical engineering sludy for the site of the proposed facility in Everett. The Vicinity Map, Plate 1, illustrates the general location of the site. We were provided with a site plan that indicated the building locations and proposed grading, and also contained topographic information. W & H Pacific developed this plan, which is dated June 30,1997. Based on this plan, we understand that the development will potentially consist of three building, two near the middle and the third near the eastern side. The buildings are proposed to have a finish floor elevation of 590 feet. The remainder of the site will generally be covered with driveways and parking lots. A stormwater detention pond is proposed at the northem ends of the eastem and westem legs of the site. Significant grading is proposed for the development, with cuts and fills up to about 10 feet in depth to reach the proposed grades. SITE CONDITION� Surface Lot 2F is located on the northwestern side of Merrill Creek Parkway, north of the Everett Boeing plant. The approximate 20-acre lot is somewhat rectangular adjacent to the street, but also has two "legs", one to the north and the other to the northwest. The highest area of the site is the southern portion, having an elevation of about 600 feet. The entire site generally slopes gently to the north. The lowest area is at the middle, northem side of the rectangular portion of the site where a wetland once existed. The lowest elevation is approximately 580 feet. Further discussion regarding the wetland area is provided in the following section of this report. The eastern and western sides of the site are slightly higher than the middle area. However, the land adjacent to the eastern, western, and northern edges of the site slope steeply away from the site. When we initially visited the site in March of 1997, much of it was densely forested except for the previous wetland area which was bare. Currently, the site has been cleared and stripped as earthwork has begun. Subsurtace The subsurface conditions were initially explored by excavating 14 test pits at the approximate locations shown on the Site Exploration Plan, Plate 2. The field exploration program was based upon the proposed construction and required design criteria, the site topography and access, and the subsurface conditions revealed during excavation. Recently, we observed the excavation of several test pits in the previous wetland area as noted below, and our personnel are currently on- site daily during earthwork activities to ensure that the stripping of organic soil is sufficient and the compaction of structural fills is adequate per our recommendations given in the Generai Earthwork and Structural Filt section of this report. GEOTECHCONSULTANTS,INC.